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Absence of giant spin splitting in the two-dimensional electron liquid at the surface of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>SrTiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>(001)
We reinvestigate the putative giant spin splitting at the surface of ${\mathrm{SrTiO}}_{3}$ reported by Santander--Syro et al. [Nat. Mater. 13, 1085 (2014)]. Our spin- and angle-resolved photoemission experiments on fractured (001) oriented surfaces supporting a two-dimensional electron liquid with high carrier density show no detectable spin polarization in the photocurrent. …